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I am the proud owner of a Ford Fiesta Zetec 1.25 Petrol, with the bluetooth sterio fitted from the factory.

Sometimes when i use the steering wheel controls to alter the radio volume or change the station or answer a phone call/hang up, I run into the problem of the controls not working.

Sometimes none of them work at all, and then next time i use the car they all work. Sometimes the button to increase the sound actually changes the station.

The controls on the radio work fine to edit the volume and answer calls, so it is only the steering wheel controls. I wondered if it could be a bad earthing connection.

Where would i find the earth for these controls ?

Any other way of fixxing it without taking it to ford and without disturbing the airbag. The Car is still in warrenty and is due its first service now, so i could ask them to fix it, but as its only an intermitent fault i expect them to say "it worked perfectly while we had it" :/